DRC/ZETA/UNIT Standard ZIGRAM Brake Rotor Fits Suzuki, Fits Yamaha - FrontStandard sized brake rotor developed for use under extreme conditions with offroad riding Thick design for improved strength Made of high carbon stainless steel ( SUS420 ) for better brake feeling and corrosion resistance Standard type is lightweight design with holes placed based on the strength analysis Mud type has a solid design to keep the mud away from the rotor and prevent frictional wear of brake pad in a muddy race